Jumboising of tshd Queen of The Netherlands

In 1999, the Dutch dredging contractor Royal Boskalis Westminster N.V. took
delivery of the trailing suction hopper dredger ’Queen of The Netherlands’.
Built by Verolme Shipyard Heusden, she belongs to world’s largest trailing suction
dredgers. The vessel underwent an extensive modification which resulted in
an enlargement of the dredger’s hopper capacity with more than 50 percent and
improved deep-water dredging capabilities.

Principal dimensions

Before lengthening

After lengthening

Length o.a.

173.15

230.71

Length b.p.p.

154.12

211.58

Breadth, moulded

32.00

32.00

Depth, moulded

13.10

15.90

Draught at international loadline

9.80

10.39

Draught at dredging loadline

11.49

13.68

Gross tonnage

22 689

33 423

Capacity

Deadweight

31 326

59 168 ton

Hopper capacity

23 347

35 500 m3

Service speed

16.7

16.0 kn

Dredging equipment

Two trailing suction pipes, diameter

1 200

1 200 mm

Dredging depth

33, 55, 85 & 112

67 & 83 m

Total installed power

27 634

27 634 kW

Dredge pump output

12 000

SB : 7 000 kW
PS : 6 000 kW

Jet pump output

3 000

3 000 kW

Pump ashore output

12 000

12 000 kW

Propulsion power sailing

20 000

23 000 kW

Bowthruster

1 400

2 650 kW

Bow discharge

1 000

1 000 mm

Bottom doors

2x 10

2x 12

Modifications

To achieve the new dimensions and capacities, the dredger was rebuilt as follows:

The lengthening section was prefabricated and fully equipped with bottom doors,
hydraulic cylinders and piping in Thailand. On completion the section was towed to a
shipyard in Singapore.
Before arrival of the original ’Queen of The Netherlands’, all prefabrication and
preparations were finalized. The vessel was then brought into dry-dock and was cut
into two pieces. Next the fore ship was floated out and the aft ship remained in the
dry-dock. Then the lenghtening section and the fore ship were floated back
sequentially.
After the dock was dry again and dock blocks were settled, both sections were
skidded to the right position, aligned and welded to the aft ship. In the meantime deck
sections, other steel sections and additional equipment were fitted. The vessel was
put back into service after a series of extensive tests.

Vuyk scope of work

In close cooperations with the owners, Vuyk Engineering Rotterdam carried out a
major part of the total engineering package required for the works in Thailand and
Singapore.